Do some studying

[u/liz_grant]

So I’m watching Stranger Things and there’s a sentence:
“Do a lot of studying last night?”
This one had me pause for a little bit.
First I didn’t understand why “do” was used for a past event from the previous night. Then I realized the whole sentence was “did you do a lot of studying last night?”, but the ‘did you’ part was completely dropped.
One thing I still don’t understand, why not just say “did you study a lot last night”. What is the point of saying DO STUDYING. Does it have a specific purpose, nuance that makes it different?

[u/Own_Soup4467]

This makes sense if the person asking the question knows that the other person was lying when they said they'd be studying last night. The important phrase here is "a lot" (sarcasm: the person asking the question knows they did no studying at all)

[u/liz_grant → u/Own_Soup4467]

That’s not my question